Variable speed power unit



June 25, D, HEYER 2,205,976

` VARIABLE SPEED PowEn mm' v Filed -061:'. 8, V1934 'S--Sheets-Sheet 2 yHun NVENTOR June 25, 1940- 0. HEYER 2,205,976

VARIABLE SPEED POWER uuu' Filed Oct. 8, 1934 6 Sheets-Sheet [N VENTOR iA TTo/NEY' June 25, 1940. D, ||EYER VARIABLE srEEnrowEa UNIT Filed Odi..vB, 1954 6 Sheets-Sheet 4 A TTORNEY June 25 1940- D HEYER 2,205,976

VARIABLE SPEED PQWER UNIT Filed Oct. 8. 1934 6 Sheets-Sheet 5 uuuduuuuoj/N VEN TOR 40 Mgg/ef Arme/vir Jmezs, 1940;

wml-ABLE srsn'rowsn UNIT D. HEYER Y 2,205,976

Filed' oct. 8.31934 6 Shasta-Sheet ATI'OR/VEY vPate'ented June 25, 1940U. S. Electrical M050",

California Inc.. a corporation oi Applicant october s. 1934. sensi Ns.741.41

1s claim. (ci. 'za-230.11)

This invention'relates to an electric motor driven power unit, in whichcontinuous speed variations can be obtained.

Such power units have in general been diss closed in several priorapplications iiled in the name of Don Heyer or jointly in the name ofDon Heyer and others. In these applications, there are disclosed variousarrangements o1 an electric motor in connection with a casing thathouses a variable transmission mechanism. This transmission mechanism inall cases comprises a pair of V-belt pulley structures, at least one ofwhich has an adjustable eii'ective diameter. One pulley structure isdirectly connected to be driven by the motor, and the other pulleystructure is arranged to drive a load at adjustable speeds.

In these prior applications, the motor and the load shaft are arrangedto have parallel horizontal axes, the axes being spaced apart generallyin a horizontal direction. This necessitates a wide supporting base.These applications can be 'identiiied as follows: Don Heyer, Variablespeed transmission device, Serial No. 519,764, iiled March 3, 1931,Patent No. 1,993,547, issued March 5, 1935; Don Heyer, Variable speedtransmission device, Serial No. 631,533, illed September 2, 1932; DonHeyer, Variable speed power unit, Serial No. 640,707, led November l.1932, Patent No. 2,078,196, issued 30 April 20, 1937; Don Heyer,Variable speed drive with multiple belts, Serial No. 667,379, led April22,- 1933; Don Heyer and Thomas (3.l Myers, Varia'ble pulley structure,Serial No. 673,333, tiled May 29, 1933; Don Heyer and Thomas G. Myers,Variable speed power unit, Serial No. 679,034, iiled July 5, 1933; DonHeyer, Ventilated variable `speed power unit, Serial No. 711,917, iledvFebruary 19, 1934; andl Don Heyer, Adjustable speed.

drive, Serial No. 732,452, illed June 25, A1934. In the presentarrangement, the motor axis and the axis of the load driving shaft are,both horizontal, but they arespaced apart generally in averticaldirection. In other words, the motor may be disposed aboveorbelow the load driving shaft; and in this way, the unit can beaccommodated on a comparatively narrow base.

It is accordingly one of the objects of this invention to provide aconstruction of this general character. v

or, In the variable or adjustable ratio ytransmising and the drivenpulley structure can have a variable effective diameter;l or Aeither 'ofthem can have a variable effective diameter, and the 5:, other a fixedeiective diameter. In the examples sion mechanism utilized inthesedevices, the drivof the inventions which will be described, both pulleystructures are adjustable; as the eiective diameter of one is increased,the eiective diameter of the other` is decreased by the correct amountto maintain the belt in proper tension at s all times.

The variation in eiIective diameters is accomplished by making eachpulley structure with a pair of belt contacting members, axially ad-`iustable toward and from each other. .'I'he op- -10 posed faces ofthese members are inclined to Io a V groove for the belt. As these facesapproa h each other, the belt must ride radially outwardly; and theeiectivev diameter correspondingly increases. lConversely, as theinclined faces sepal5 rate, the belt is permitted to move radiallyinwardly, and the effective diameter -is reduced.

In the above-mentioned prior applications, several differentmcdiiications oi this general arrangement are shown and claimed. Thevpresent .20 invention embodies further modifications; particularly withrespect to the mechanism for'indieating the speed ratio, the mechanismiorshifting certainV of the pulley sections, and the arrangement ofreduction gearing. ,g5

It is another object of this inventionlto provide an improved form ofventilation for the enclosing casing; and more specifically to providei'ans on the pulley sections that can be con veniently balanced. f, 30

It is another object to arrange the casing in 'such a way that access tothe interior thereof, for repairs or replacement, is facilitated.

It is still another object of the invention to provide an improvedsupport for the adjustable .35 pulley structure, whereby the slidingsections are mechanically held in proper sliding relation, and withoutdanger oi' sticking.

It is still another object o1 this invention to provide a compact. andconvenient arrangement lo of parts to permit ready and quick adjustmentof the various adjustable elements.

'I'his invention possesses many other advantages, and has other objectswhich may be made more easily apparent from a consideration ot 5several, embodiments of the invention. For this purpose there are showna few forms in the drawings accompanying and forming part of the presentspecification. 'I'iies'e -forms will now be described in detail.illustrating the general prin-v 5'0 chiles oi' the invention; but it isto be understood" that this detailed description is not to be takeninalimitingsensasincetheseopeoftheinvention is'best deilnsd by theappendedcisims. y Referring to the v,

Figure l is a view. mainly in vertical section, of an upright power unitincorporating the invention;

Fig. 2 is a detail sectional view illustrating the g manner in which thedriving pulley structure as well as the driven pulley structure areadjustable to vary their effective diameters;

Fig. 3 is an enlarged horizontal sectional view of some oi' themechanism for varying the ratio Vl0 of the power unit:

Fig. 3a is an elevation ofthe indicating dial;

Fig. 4 is a side elevation of the power unit shown in Fig. 1;

Fig. 5 is a view similar to Fig. 4. but showing l5 the driving elementsincorporating the electric motor as interchanged in position with thedriven elements;

Fig. 6 is a view similar to Fig. 4, showing a further modification inwhich a single reductionv N gear train is connected to the driven shaftfurther to reduce the speed of driving of the load:

Fig. 'I is an end elevation of the gear case shown in Fig. 6, with thecover removed:

Fig. 8 is a view similar to Fig. 5, but illustrating Il the use of adouble reduction gear in combination with the driven elements; and

Fig. 9 is a top plan view partly in section of the unit shown in Fig. 8..e

In the embodiment ofthe invention shown in- I0 lligs. l to 5, an uprightcasing i is shown, in which are housed the driving pulley structure aswell as the driven pulley structure, together with their associatedcontrols. In Fig. 1 the driving pulley structure 2 is illustrated asdirectly mounted upon the motor shaft4 I. In the present instance thismotor shaft I is shown as extended from. the motor I to form a drivingshaft exten-V sion. This motor I can be of the usual enclosed type. witha downwardly directed bell mouth l I for the entry or exit ofVentilating air.

The motor I is shown in this instance as supported on the outside of thevertical wall I of the casing l. The motor shaft I has a horizontalaxis. It is mounted in ashouldered aperture I 'Il in this wall 5 as bythe aid of bayonet slots. The end frame 'i oi' this motor is'providedwith a downwardly directed opening I for the admission or discharge ofVentilating air. Furthermore. this end frame 1 has a hub I which extendsthroughl l0 the aperture I into the interior of casing I. This 4hub Iserves as a support for'various elements of; the mechanism whereby theeffective diameter of pulley structure 2 can be adjusted.

This pulley structure 2 includes a pair of sec- Il tions II and Ilhaving opposed inclined faces. These sections II and Il are arranged tobe axially adjusted withI respect to each other so that the exibleV-belt I2 can be engaged at its opposite edges at different radialdistancesv from -eo the am of shaft a. In this way the ehecnve diameterof pulley structure 2 can be adjusted.

In the present instance pulley section II is shown as rigidly mounted onshaft I as by the aid of a set screw II passing through the hub of sec-I tion I I `and engaging the shaft l. vA key Il can also be providedfurther to ensure against relative angular motion. c The section H isprovided with an elongated hub il having a reduced portion II. This hub70 is rigidly connected as by one or. mre pins l1 to a longitudinalsleeve'lI slidable on`shaft II. This sleeve II'is made from lubricantretaining bronze. It can be keyed to the shai't I as by the aid of thelrey Il.

1s In order to move section Il toward and from against al shoulder inthe cup II.

- It is apparent that by changing the. width and the location of spacersI2 on extension II, the axial f matter of a prior application filed inthe name of the'hub I; 'Ihis cup'has a fastened to the inner e ofthecupand to maintain a thrust ball bearing!! in position bearing thus hasits outer race held in a stationary position, and its inner race is heldon the extension II of hub il. It is heldin place as by the aid of oneor more spacers l2 and a lock nut II.

position of pulley section il can be adjusted to accommodate varyingbelt widths. This method of adjusting for belt width is made the subjectil Don Heyer, Berial No. 732,452, filed on June 26, i934, and entitledAdjustable speed drive.

The cup il has an end flange Il and an intermediate flange 2l providedwith felt packer washers ZI engaging the sleeve II. In this waylubrication'chaxnbers 21 and II are formed inside of the cup II. Alubricant can be supplied to these chambers as through a passageway 2Ithrough the end frame 1. This passageway communicates with the annularspace II in the inner surface of hub I. This annular space in turncommunicates with a slot Il in the outer surface of cup II. This slotIlv has openings I2 and I3 leading respectively to the chambers 21 andII.

The lubricant in chamber 21 can pass through opening Il so as to flowbetween the sliding surfaces of shaft I and sleeve II. The lubricant inchamber II serves to keep the thrust bearing 2i in proper runningcondition. Furthermore. the lubricant in groove Il also serves tolubricate the contacting surfaces of cup Il and hub I.

In order further to ensure against corrosion or sticking, it ispreferred that these contacting surfaces be plated with a non-corrosivelayer such as chromium. For example. the shaft I canbe turned downslightly below a slide fit in sleeve II. Then a layer of chromium can bedeposited thereon to build it up beyond the size required fora slidingfit. After this is accoml plished, the chromium plating layer can beground down by a line grinding wheel to the desired slide nt'size.

The cup II is adapted to be axially moved in the hub I by the aid of afork mechanism illustrated most clearly in Fig. 2. In thisI figure it isseen that afork Il embraces the upper half of the hub I and is pivotedas by pin III in a boss II', integral with the hub I. The extremities ofthe fork are slotted and accommodate pins II-Il which extend radiallyfrom the cup, and through slots II and II in the sides of the hub I. Thefork Il has an upwardly extending clevis 4 0 engaged by a pin Il. It isapparent that motion of pin Il in a directionaway from the plane of thedrawing of Fig. 2 will cause the cup II to be moved axially. The mannerin which this pin li is movedwill be described hereinafter.

Opposite the pulley section II there is a cover plate 42. This coverplate has a series of downwardly `directed louvres II. It also has aninwardly extending conical deflector M. This cover plate l! thus servesas a Ventilating opening for the passage of Ventilating air. The airinside of casing I is arranged to be kept moving. as by the aid of aseries of fan venes Il integrally attached tothe rear of the sections lI and Il. Adjacent the outeredge of each of the sections an enlarged rimor ring can be provided to assist in balancing. Holes can bey drilled inthese rims or 75 'museum-un i.

2,905,970 rings in the course of this balancing process.;

as illustrated for exampleat |1I'.'in pulley sec tion Il immediatelyabove pulley section |I.

The driven shaft 41 in the form shown in Figs.

' 1, 2, 3 and 4 is. disposed above the driving shaft I, .On it issupported a driven pulley structure 4I,

of the same general character'asfthe driving pulley structure 2, but vofsomewhat larger diameter. Y

The right hand end of shaf-t 41 can be supported as by the aid of thrust.ball bearings 4I; The outerv race of" this ball bearing can be securedAinside of a boss II of a cover plate'IL It is held in place by a-dust-proofcap I2. lThe inner race of bearing 4I is tightened against ashoulder non shaft 41 and is held in place by on'e'o'r two lock nuts I4.'I'hecover Il is disposed in an annular seat I5 disposed aroundanaperture 56 in the vertical wall I1 of casing -i. The boss I0 has anaperture Il through which the load driving'extension II of shaft41'extends. i

Driving of the pulley structure 4I is accomplished by thev aid of thebelt i2 which serves-as a mechanical driving connection between the two.pulley structures 2 and 4I.

Iny the present instance the pulley structure 48 includes the sectionsII and Il each provided with rear vanes I2 forming ventilating fans.

The adjustment for varying the eilective pulley diameter of pulleystructure 4I is accomplished -by moving section Il axially. For thispurpose section 6|. is rigidly mounted on a sliding sleeve member 63.This is accomplished as by the aid of the key G4 and setscrew II. Thissleeve is preferably made from steel, and is chromium plated o n itsexterior surface. It carries; as shown most `clearly in Fig. 3, left andright hand bearing bushings I6 and 61. which'are preferably made fromlubricant retaining bronze'. These bushings slide upon the shaft 41, theinner surface oi' sleeve 63' between these two bushings being clear oi.'

' the shaft. In this way the sleeve II issupported at widely spacedplaces on the shaft 41.

The shaft surface can be-treated with a noncorrosive layer as describedin lconnection with `Shaft 3.

In order to support shaft .41, .at-its left hand end, a ball bearingstructure II is provided. lThis ball bearing structure supports the lefthand end of sliding -sleeve II which in turnsupports 'the shaft 41. Theballbearing structureis shown to best advantage in Fig. 3.. Itis thereseen that the vouter race is'supported against a shoulder I! ,in

a slidableA cylinjdrical member 1I. Itis held in place against shoulderI9 as bythe aid of a cap 1|.' The inner race of ball bearingistructureII is abutted against a shoulder 12 on sleeve II and is held tightlyagainst that shoulder 4as bythe 1 clampv nut 13. The sleeve 83 beingmade from steel, it forms a solid support forbearing structure 68; thisis a better arrangement than the use vof a 'sleeve made entirely ofbearing, bronze.

The cylindrical member 1I is s lidable for axially adjusting thepositionof section Il, within` a cyiindritai boss 14. This cylindrical bossisshown v as integral with a cover plate 15 fastened in an aperture 16 inthe vertical wall I of the casing I.

'I'he arrangement issuch that thelaperture 1I v is 'made ofidenticaldimensionsfas aperture; Ifin which motor 4.issupported, whereby itis'possible to interchange the position of the motor with the [drivenpulley structure- Tlfiisinterchanging" of position is indicated in Figs.4 and 5. In Fig. 4

' v'the motor 4 is below the driven pulley 'struc-ture;

and in Fig. '5 itis above the driven pulley structure. In this way theload driving extension II- can be placed either close to the base ofcasing-I or at aconsiderable 'distance "-above lthis base, `whereby themost advantageous position of the load driving shaft can be chosentosuit the con- .5- ditions of the load@ 7 f l Similarly the covermember Il is interchangeable withthe cover member 42;

'I'he advancing of the sleeve'II towardl the left or toward the right isaccomplished by the aid n)` o f a hand wheel '112 This hand wheelserves'to rotates screwJI engaging in threads in a boss 19'oi cap 1|.Rotation of cylindricalmember 1I is effectively preventedas by the aidofthe radial .pins II and`I|` which project through appropriate is slotsinthe boss 14. ,i f

Lubrication for the bearings and the sliding surfaces isprovided for bythe'aid of a conduit I2 leading to .a'n annular space II surrounding -Vi the cylindrical member, 1I. 'mis annular space go Jcommunica'teawith aslot I4 in the outer surface of the cylinder memberv 1I. From this slotI4 there leads a passageway II tothe chamber. I1 formed between thecapni1| and an intermediate flange II. It .is in this chamber 'that'theball g5 bearing structure II is located.

The screw v"II is provided with a smooth portion II -for theaccommodation of a thrust ball bearing ,structure 1s. This thrust .baubearing structure is located in the end wall II of boss A142 The ballbearing is held-'against axial displacement as by the aid of collars Il.It is" apparent that upon rctation of wheel 11 the sleeve ,II with itsassociated pulley section A Il. is adjusted axially with'respecttovpulley sec- 85 tion II. This adjusting motion iscausedto move thedriving pulley section Vinthe samey direction. This -is accomplishedbythe aid of a forked member I2 (Fig. 2).' The extremities of this forkVare slotted to'accommodate the' pins Ill-Ii and 40 Y the fork is'oscillated about the 'axis of pin II passing throughv ear II' integralwith the cylindrical boss/'14.. The lower extremity of fbrk-IZ pulleyvsection will'be correspondingly -moved by'lthe'fork I4, to move pulleysection Il toward pulley `section I, thereby increasing the( eilective'diameter ofthe driving pulley. Q

The left 'pulley sectionII oi thedrivenpulley structure 4I is splined asby key I4to the sleeve 55 II. Instead of being maintained absolutely^staj ticnary', thissection II'ls-arrng'ed-tobe urged under spring pressuretoward the right totake up for' belt wearf For. this purpose the hub IIof vpulley section II is elongated to' provide along sliding 50-surface. Through the hub extends-a pin I1.v The left hand end oftheshaft Q1 is Slotted asshown' at II to permit the pin -Ijvto'passtherethrough; andsimilarl'y`-sleeve II; is slotted as shown at IL 'rto permit relative, al adjustment between the 6". sleeve and the p'in.The spring for urging p`ulley sectionvIIto take'up'for belt wear isindicated at I I I. lAt .its 4right h'alld, e`l1d it abuts against s'thepiijiltl Its'left hand end abuts against-"an 70 adjustable headless'screvir iII-I threaded in v the left. hand endo! the hollow portionofshaft-l 41': f. This headless screwvv carr'be adjusted as byfthe..waid of a'screw driver entering through-the -axial i "-openin'gj |I-(Fig.13i the s`crew 1I at- 7;,

tached to handwheel 11.' This opening can be normally closed as by aheadless screw |03.

It is apparent that relative angular motion between pulley'section'lland shaft .41 is prevented not only by the use of the spline 54=but alsoby the engagement of pin 31 in slots 53 and 33. In order to secure agood sliding surface between hub 95 and chromium plated steel sleeve 53,an appropriate bearing bronze bushing |04 can Vbe fastened inside of thehub '95. l

Some lubricant may pass into the hollow por tion of the shaft 41; andlit may be thrown out by centrifugal force against the surface of sleeve53 by the provision of radial apertures |05.

In order to facilitate inspection or replacement of the variable ratiotransmission mechanism in housing it is preferable to provide Aa pair ofside covers such as |06 (Figs. 4 and 5) fastened I to the oppositevertical walls of casing i; These plates |06 can be provided withdownwardly extending louvres |01 for the free passage of ventilatingair. Furthermore, as shown most clearly inv Figs. l, 4 and 5, the casinghas a forwardly extending foot |08 to lend stability to the structure.This foot |08 extends a considerable distance forwardly of the casingandv underneath the overhanging structures at the left hand side of thecasing. The bottom of the casing as in.

dicated in Fig. 1 is entirely open.

In order to provide va speed or a ratio indicating device, a circularvdial |09 is provided. 'I'his dial is fastened asiby screws ||0 to asupporting member in turn supported on the boss 14. A pointer ||2extends from inside of boss 14 to the outside thereof and has adownwardly directed pointer end ||3 cooperating with scale |09. Thispointer is pivoted as by the aid of a screw ||4 and its inner end issubjected to a force exerted by an adjustable screw ||5 fas tened to thecap 1|. A spring can be used to urge the extension I6 against the headof screw ||5. The pointer 2 furthermore can be made in two partsrelatively adjustable to make it possible to calibrate the scale. Bothparts can be provided with slots such as indicated at ||1 to permitslight angular displacement between the pointer end ||1 and the inwardlyprojecting extension H6,

It is noted that the distance between the center of pins 93 and-4| isgreater than the distance between the pins 4| and ||8 upon which fork 34is pivoted. Thus fork 34 moves pulley section at a different rate fromthe rate at which pulley section 6| is moved. This is utilized to ensurethat the belt will remain tight for all positions of adjustments. Itisfully described and claimed in an application filed in the name of DonHeyer on February 19, 1934,- Serial No. 711,917', for- Ventilatedvariable speed power unit.

In order to limit the adjustment of the adjustable sections and 6| useis made of an adjustable abutment in. the form of a screw H3.

This screw is threaded through the cover member and its inner end isadapted to cooperate with the lower arm of shift fork 32. It is held inadjusted position as .bya nut |20.

In the .form of the invention shown in Figs. 6 and 7, the driven shaft|2| is shown as extended toward the right to drive a single reductiongear mechanism, so that low speed load operation is secured. In thisinstance the gear case |22 isrshown as replacing the'cover member 5|,and is machined to fit the circular opening 55. Thisgear case has anintermediate hub |23 accommodating a thrust ball bearing |24.

air in or out of the casing shaft |35.

Vmaterial can be used in boss |35, to center or locate 4 driven shaft|43.

rthe casing as well This ball bearing is, enclosed in a. chamber |25.

-Its outer race is held between 'the dust proof cap |25, provided with alubricant retaining (seal, and the ange of hub |23. Its inner race' isheld against the shoulder |21 of the driven shaft |2|. This space |25can be supplied with oil or other lubricant, from the gear case |22; andspace |25 is made of extended. length to prevent escape of oil into thehousing I.

The space to the left of the intermediate hub |23 is open. to theatmosphere as'by a downwardly directed passage for the transfer of Theright hand portion of the gear case |22 can be closed as by acovermember |23. In the space |30 formed to the right of the hub |23 islocated thehelical pinion |3| and thefcorresponding helical gear |32.The pinion |3| is fastened to the right hand extremity of the drivenshaft |2| and is spaced from the bearing |21vas byV collar |33. Thespace |30 can also be filled with lubricant such as` oil, and alubricant throwing disc |34 -can be accommodated at the right hand endof the pinion |3|.

The gear |32 is supported on the load driving This load driving shaft issupported at one end between bail bearing structure |36 supported in' arecess |31 in the gear case |22. The right hand end of the loacl drivingshaft |35 is similarly supported by a ball bearing struc- 4ture |38 inboss |39 of the cover |23. A lubricanty retaining washer |40 of felt orother yielding lThe cover |29 lis accommodated over the at surface |4I,which is a finished surface at the right hand side of the gear ca'sing|22. At the upper end there is arecess or depression providinga`shoulder |42, concentric withshaft the cover |29 accurately with respectto the casel22.

It is to be noted that since the gear case |22 is supported on acircular shoulder, it is possible to rotate the entire gear case aboutthe axis of shaft |2| in order to provide varying positions of the loaddriving shaftv |35.

In the form of the invention shown in Figs. 8 and 9, the driving motor4is shown as disposed instance there vis a double reduction gearing, in

.which the load driving shaft |44 extends out of the gear casing |45concentrically with the The gear case is made in this instance in threeparts.v The inner part |45 forms virtually an end frame for motor 4 andis accommodated in the aperture |41 in the side of the casing I. wardlydirected opening |48 to the exterior of as an inwardly directeddeflecting flange |49. At the right hand end of this frame there is aboss |50. In this boss is accommodated a ball thrust bearing structure|5| for supporting the right hand end of the driven shaft |43. `A dustcap |52 provides a lubricant chamber for the ball bearing structure |5|.

At the right hand extremity of driven shaft |43 is the pinion |53 whichmeshes with a gear |54 as shown in Fig. 9. This gear is mounted on ashaft |55, supported at spaced points by V.and the right hand end wallof this gear case.

Intermediate these bearings |56 and 4|51 there is a wide driving pinion|59 which meshes`with the gear |30. This gear This end frame has adown-` |60 is mounted on the K5 load driving shaft i". Thisload drivingshaft has a thrust ball bearing structure III in the intermediate wallof the casing` Ml. At the right hand end the load driving shaft I issupported by a similar ball bearing structure |82. This ball'` bearingstructure is supported in the boss I of the end cover IM. The shaft Icarries an oil slinger disc |65. 'I'he space between the right hand wallof member |46 and the cover l 6l can be supplied with lubricant, havinga level high enough to reach gear |60 and oil slinger lli. The oil canbe confined against escape as by appropriate lubricant retaining seals.such as felt washers. Such a washer |88 is illustrated in boss I, a

It is apparent that by making the gear casing and covers interchangeableas well as the positions of the driving and driven transmissionelements, a wide variety of combinations of drives can be obtained withthe same mechanism.

lI'he mode of operation is apparent from, the lforegoing. The casing isadequately ventilated and a wide range of speed is obtainable bythemanipulation of the hand wheel 11.

1. In combination, a c asing, a variable speed transmission mechanism insaid casing and including a horizontal driving and a horizontal drivenshaft, means for ladjusting the speed ratio of said variable speedtransmission, said driven shaft having a portion extending out of thecasing for connection to a load. one of said shafts being verticallyabove the other, a source of. power supported by the casing, supportsfor theshafts, for said ratio adjustingmeans and for the source ofpower, supported on the walls of the`casing, said supports beinginterchangeable so that the relative positions of the driving an 'thedriven shafts can be interchanged.

4o 2. In an adjustable pulley structure having a pair of relativelyaxially adjustable sections with opposed inclined faces, forming byaxial adjustment, variable edective pulley diameters, the combinationtherewith of a hollow shaft supporting said sections, a spring in theshaft resiliently urging one pulley section in one direction, meansincluding a screw for adjusting the axial position of the other of saidpulley sections, said/screw being axially alined with the shaft, and anenclosure for the shaft, said enclosure having an aperture formedtherein for providing access to said spring for adjusting the pressurethereof, and saidscrew `being available for manipulation outside of theenclosure.

3. In an adjustable pulleyl structure having a pair of relativelyaxially adjustable sections with opposed inclined faces, forming byaxial adjustment, variable effective pulley diameters, the combinationtherewith of a hollow shaft supporting said sections, a spring in theshaft resiliently urging one pulley section in one direction, meansincluding a screw for adjusting the axial position of the other of saidpulley sections, said screw being axially alined `with the shaft, and anenclosure for the shaft, said screw being available for manipulationoutside of the enclosure, and having an axial aperture toV permit entryof a tool for adjusting the spring pressure. l

4. In combination, a casing, an adjustable ratio transmission 'mechanismin said casing, said mechanism including Vwbelt pulley strucl at leastone of them having op- 'posed adjustable pulley sections, the axes ofthe',I pulley structures being horizontal and arranged one above theother, an electric of said driven shaft.

motorA supported by the aid of an aperture in the outer wall of thecasing. shafts for said pulley structures, one of said shafts beingdriven by said motor, and the other shaftfbeing adapted to drive a load,means carried by the walls of the casing for supporting the drivingpulley structure and the driven pulley structure, the-said means beinginterchangeable to permit a reversal of the relative positions of theAdriving and driven shafts, and a reduction gear structure adapted to besupporteduon the exteriorof the casing, and in driving relation with thedriven pulley structure, said gear structure being so associated withthe driven shaft as to form a unit therewith irrespective of any changein position 5. In a geared adjustable speed power transmission, anadjustable ratio power transmission including a driving pulleystructure,v a driven pulley structure and a belt for transmitting powerbetween said pulley structures, each of said pulley structures having anadjustable effective diameter and including a pair of pulley sectionswith opposed inclined faces, forming 'by relative axial adjustmentvariable effective pulley diameters, a casing having walls enclosingandk means for supporting said pulley structures,

a gear transmission having a drivingshaft, a, `driven shaft and gearmembers for transmitting power from said driving shaft to said drivenshaft, said driven pulley structure being in coaxial driving relationtosaid driving shaft of said lgear transmission, a gear housingenclosing 'said gear transmission, said driven shaft having a loaddriving extension projecting outside of said gear housing, means forsecuring said gear housing to the wall of said casing adjacent saiddriven pulley structure, and a sub-base `secured to said casing and tosaid gear housing, and providing common means for supporting said geartransmission and said adjustable ratio power transmission.

6. Inv a geared adjustable speed power transmission, an adjustable ratiopower transmission including a driving shaft, a driven shaft, a drivingpulley structure mounted on said driving shaft, a driven pulleystructure mounted on said driven shaft, and a belt for transmittingpowerv between said pulley structures, at 4least one of said pulleystructures having an adjustable effective diameter and including a pairof pulley sections having opposed inclined'faces, forming byv relativeaxial adjustment variable effective pulley diameters, a casing'havingwalls enclosing said pulley structures and means for supporting saiddriven shaft, a load driving shaft, a gear transmission havixgg gearsfor transmitting power from said driven shaft to said load drivingshaft, the driving gear of said gear transmission being in coaxialdriving relation to-said driven shaft stantially parallel to the axis ofsaid driven shaft, a gear housing having walls enclosing and'supportingsaid gear transmission, and a sub-base;

removably secured to said casing and to said gear housing, said gearhousing and said casing having supporting surfaces formed thereon forengaglng said sub-base..

i and said load driving shaft having its axis subformed on one wallbeing. substantially opposite 75 6 to the pair of surfaces formed on theopposite facing wail. lan adjustable ratio transmission mechanism insaid casing, said mechanism including a driving shaft.'a driven shaft, adriving pulley structure mounted on said driving shaft, a driven pulleystructure mounted on said driven shaft and a belt for transmitting powerbetween said pulley structures. at least one of said pulley structureshaving an adjustable effective diameter'. whereby the variation in speedratio is ob# tained. an electric motor supported on a wall of the casingand in driving relation to the driving shaft, bearing means forrotatably ,supporting said driving shaft and supported by one of saidpair of supporting surfaces formal on on of said walls. and bearingmeans for rotatably supporting said driven shaft and supported by one ofsaid supporting surfaces vertically displaced from said driving shaft.said pair of vertically displaced and substantially equivalentsupporting surfaces formed oneach of said opposite facing wallsproviding means whereby the adjustable ratio transmission mechanism maybe assembled with the driven shaft above orv below the driving shaft,and the motor associated with said shaft.

8. The structure as set forth in claim 7, in which said casing isprovided with a second pair of opposite facing vertical walls.. each ofsaid second pair of structures, and a pair of removable covers forrespectively closing the apertures formed in said second'pair ofopposite facingwalls.

9. In combination, a casing. a variable speed transmission mechanism insaid casing. including a horizontal driving shaft and a horizontaldriven shaft, as well as means for adjusting the speed ratio of thevariable speed transmission, one of said shafts being disposed above theother: a source of power supported by the casing and operativelyassociated with the driving shaft. and means adapted so to support said`shafts. the ratio adjusting means and the source of power. that therelativepositions of the shafts with respect to the casing may beinterchanged, the source of power and the driving shaft in intorchangedposition occupying the nrst position of the driven shaft and the ratioadjusting means.

l0. In combinationI a casing, a variable speed transmission mechanism insaid. casing, including a horizontal driving shaft and a horiaontaldriven shaft. as 'well as adjustable pulley structures respectivelymounted on said shafts, one of said shafts being disposed above theother: means associatedwith one of the pulley structures for adjustingits effective diameter, interlocking means between the pulley structuresfor adjusting the other pulley structure, an electric motor associatedwith said other pulley structure, means supporting the driving shaft,the electric motor and the driving pulley structure upon the wallshaving an aperture formed i 'therein providing access to said belt andpulley andere casing. and means supporting the driven shaft, the drivenpulley structure and the means for adjusting the effective diameter ofthe driven pulley structure upon the casing, -said twol"sup portingmeans being interchangeable in position with respect to the casing.

1l. In combination, a casing. a variable speed transmission mechanism insaid casing, including a horisontal driving shaft and a horizontaldriven shaft. as well as adjustable pulley structures respectivelymounted on said shafts. one of' said shafts being disposed above theother; anv

transmission mechanismin said casing, including a horizontal drivingshaft, a horizontal driven shaft. and means for adjusting the speedratio of said transmision associated with the driven shaft, one of saidshafts being disposed above the other; a source of power operatively'associated with the driving shaft. and means cooperating with saidcasing. said means and the cas-- ing being adapted so to support saidshafts: the ratio adjusting means and the source of wer. that therelative positions of the ratio adjusting means and the source of power.together with their associated shafts, may be interchanged with respectto the casing, the source of power and the driying shaft in interchangedposition occupying the first position of the driven shaft and the ratioadjusting means.

i8. In combination, a casing. a variable speed transmission mechanism insaid casing including a horisontal driving shaft, a horiaontall drivenshaftas well as adjustable pulley i structures mounted respectively onsaid shafts. one of said shafts being disposed above the other. 'agearing structure having gearing in operative relation' to the drivenshaft and a gear case, said gear case having means providing a supportfor one end of the driven shaft. means providing a support-for the otherend of the driven shaft, means providing a support for the drivingshaft. andk means cooperating with the casing, said means and the casingbeing adapted so to support said,

gear case and the support providing means for the shafts. that therelative positions of the gear` case and the supporting means for thedriven shaft may be interohanged with the supporting means for thedriving shaft. the driving shaft in intcrchanged position occupying thefirst position of the driven shaft.

UU DON HEYER.

